Process of dehydrating gypsum



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" tl v will Patented Aime", 7, W23

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Be it meme thet we, FRANCIS B. STUART end Cmems A, Rimes, citizens of the United Stetes, end residents of El Pese,ie

the county ell El Peso end 'Steleet Texas, have mventeol 'certem new usetul Immovements m the Proeesses ezl Dehyolretmg Gypsum, of which the tellevvmg as e speelficet I" 1 @c-s w, 1 21s mvenmon relates to en mpleveo,

sh peecess t elehydretlhg gypsum and cemplehenols e simple and inexpensive prccese of this whereby meisture content l'emghly removed end the ce Meecl he leter larch-en up 02? emshetl in usual te precluee Perle.

lfelmlhg the subetleh eohteteplet tleh s sum to steem presehy posslhl mt hummg o't gypsum, l'requently eecers a meist'ere content eveseretedl by means 025.

be e. "zrely olovietecl.

' k elejeet of the meteriel eeenemy vehtr te eheet e use cl fuel 9 viele e etecess e mll else etlmlt e tlehychwtmh ml the reel m, We relay eehsmemtle Wests W meltleset tn the hee crushing e2 gypsem prior te eel will he ehvleted,

the she e the levee. m the of o'er lmpvevec Weeess, hlch 'WQ will herein mere fully tleecrilre ehtl pezitloelerly @Qlll'l' but in suhjelhetl tlehytlretiee e1 celcleetlen of gypsum, it hes heretofote heeh e cemmole precte reek up the reek then heet the smell pettlcles by means of an. open fire, so as to drive out or eveporete the moisture content. This process is Weste'ful end else quite expensive lit necessitates the employment of slallled end experienced help to cerefully Watch end examine the materiel etihtervels to see that the required; degree of? heat is at all times eppliecl end t0 prevent lemming which would result in imperfect celcinetien. Also by such heating process, smell perticles of gypsum-ere eerriecl oh by the esceping stee It has been found that this results in efloss elf. sulotentielly twenty per cent,

Awlleetles mee lilereh ee, gene. hem he.

The ehoveheted objections to the heetimg process, which is new in geherel use, heve been successfully overcame by mews of the present inventio llt hes been cemmehly supposed that gypsum celmot he dehydretezl end celcined by the use of eteem, W e have, however, demonstrated te our entire setisfaction that this cee he clehe ehcl that the steam process to he presently described also results in it better end. cheaper product.

ln cerrylng out our inveetloe in pmetiee, We pleee the gypsum, pre'lembly reel; form, m steel cers end he cuts into cylinders having diemeter sheet After boltihg on the cylihdezt heetl, sh m is let hate the cylinder until eeessure e hp proximately one hundvrecl Mil penises pet squere inch is re reel Steers is maintained at presse fol e peeled; epproximetely fem heme, length 0:? time depending largely upon the physical structure of" the 3 sem te he wlehie At the expireticn e peeled the steem see ply is shut etf'emu efter the pressuee vvlthlm cylinder hes eenslelez'ehly melee-eel, the.

eelenee 0f the steem hl 013? when the removel of the see time eyzllmelee will he felled thet been 1mifermly clehyrlreed eel ef its Welter? cement, ev -cl new pulverized. F 01: izihg mechlhes, sueh pleye-cl, he eserl, form is commercially known plaster of Perle end is mixed with the? sub-silences in. the memlfsctute of helleva and other products in which gypsum i 'prlmeey censtitueet. it will he uppers e by means st the steam process eoeve tleseeiheoi, e considerehle swing in eensemflleh of feel may he reelizetltwee the fire peecess, Further,lt is ehly necessary te employ e single firemen attend to the of boilers and all elenger the gypsum being over or uhcler heeted is peecluclevl. "forcing out the water by means of Slfifilfl. pressure, We cloviete loss of the gypsum es is ecees-ioned in the use of the live or heating process above referred to, no pert ofthe gypsum will he carried out, There will, however, he e minimum less in Weight olue only to the removal of the Wet er;

From the foregoing, it will be appreciated thet We heve oleviseol e process of dehydret leg gpsum which is of gTeetly inereeseol util- (Ill?) specified a. certain ity over other processes for this purpose as now known in the art. "We have herein steam pressure to be maintained upon-the gypsum, but it is understood, of course, that theremey be considei'eble variation within cert-sin limits in this pressure. Neither do we desire that the invention should be limited tothe application of steempressure to rock since, if desired, the gypsum may crushed or broken. iowever, we

first be have found in practice that by treating the gypsum in rock form, it may be much more easily broken and pulverized after itis eeloinedu It; is scoordingiy no; he understoooi that we reserve the privilege of reso ting to such variations in our impmved process as may be fairly embociied' Within the spirit. smi seogge of the invention as claimed.

We eieimz 1. A v oroeess of dehydrating gypsum which consists in subjeoting rook gypsum so steam pressure at epprozumeteiy one hunaired enci fifty pounds for e PEBElOd. of siprommetel four hours then shutting off the gypsum alone,-

in tile-i;

steam and after a. reduction of the steam pressure by eondenseticm blowing ofi the remain ng steam.

2. That method of dehydreting gypsum which eonsists in subjecting rockgypsum 111 "which consists in piecing rook gypsum in e closed container above the bottom phereof, introciuoing steam to the container for a predetermiined period; of time, and closing (iii the steem'suppiy site? suoh'period of time has eiepseoi to gradually reduce the pressure by oon ziensetion.

they eieim the fosegonvent-ion, have signed their names heeeuncier. I

FRANCIS. STUART, A, RU EES 

